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Recent Accounting and Regulatory Pronouncements - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Impairment of goodwill |  | $ 0 |  |  |  |  |  |  |
Impairment of other intangible |  | 0 |  |  |  |  |  |  |
Additional allowance for credit losses for loans |  | 440,159 | $ 434,608 |  |  | $ 56,927 | $ 60,255 | $ 58,213 | $ 55,798
Deferred tax assets |  | 107,500 |  |  |  | 31,316 | 27,844 |  |
Additional reserve for unfunded commitments |  | 43,200 |  |  |  |  |  |  |
Retained earnings |  | $ 604,564 |  |  |  | 679,895 | $ 646,325 |  |
ASU 2016-13 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Additional allowance for credit losses for loans | [1] |  |  | $ 54,438 |  |  |  |  |
Deferred tax assets | [2] |  |  | 12,639 |  |  |  |  |
Additional reserve for unfunded commitments |  |  |  | 6,400 |  |  |  |  |
Retained earnings |  |  |  | $ (44,820) | [3] | $ 44,800 |  |  |
[1] | This is the calculated adjustment to the ACL related to the adoption of ASC 326. Additional reserve related to non-acquired loans was $34,049, to acquired loans was $16,981 and to purchased credit deteriorated loans was $3,408.
[2] | This is the effect of deferred tax assets related to the adjustment to the ACL from the adoption of ASC 326 using a 22% tax rate.
[3] | This is the net adjustment to retained earnings related to the adoption of ASC 326.

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